Grain-drill tooth or hoe



-(No Model.)

G. W. KIRKPATRICK.

GRAIN DRILL TOOTH 0R HOE.

No. 332,717. Patented Dec. 22, 1885.

W E SE5 a... w/gzim N. PWERS, Phulwlithographar. Washington. D. c.

NITE STATES ATENT Fries,

GEORGE XV. KIRKPATRICK, OF MAOEDON, NE? YORK.

GRAlN-DRlLL TOOTH OR HOE.

SPECIFICATION forming part of Letters Patent No. 332,717, dated December 22, 1885.

Application filed September 3, 1885.

To all whom it may concern:

Be it known that I, GEORGE W. KIRK- PATRICK, of Macedon, in the county of YVayne and State of New York, have invented a new and useful Improvement in Teeth or Hoes for GrainDrills or Seeding-Machines, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, making part of this specification.

My invention relates to that class of teeth or hoes, whether in drills, seeding-machines, cultivators, or wheel-barrows, which are held in working position by means of what is usually termed a break-pin, from the fact that when the hoe or tooth meets an obstruction in its path of sufficient magnitude to endanger its safety, the pin which holds it in operative position is of such material as to adapt it to break and allow the tooth or hoe to turn on its pivotal connection with the draw-bar, and thus to pass over the obstruction, after which it is replaced in working position, and a new pin inserted in place of the broken one, for holding it in such position.

It consists in a novel construction of tooth, or of the rigid arm or flange through which the tooth is pivoted to the draw-bar, the latter being provided with a ratchet face or teeth arranged in an arc of a circle of which the pivotal connection between the tooth and dragbar is the center, or substantially so, and an yone of which teeth may engage the retainingpin for holding the tooth in working position, and in the combination therewith of a breakpin supported in a pivoted arm and forming in connection with the latter a pawl for bolding and for facilitating the adjustment of the tooth, obviating the necessity for removal of the pin for the latter purpose, and in the combination, with the pawl, of a spring for forcing the break-pin into engagement with the rack on the tooth-flange and preventing accidental displacement thereof, as hereinaf ter explained.

In the accompanying drawings, Figure 1 is a perspective View of as much of a grain-drill as is necessary to show my improvement. Fig. 2 is a-plan view of a portion of one of the dragbars and tooth flanges or arms, and Fig. 3 is a side elevation of the parts shown in Fig. 2.

A represents a portion of one of the side or (No model.)

longitudinal bars of the machine-frame; A, a portion of one of the transverse fran1e-bars; B B, two parallel bars pivoted in the side bars of the frame, and to which the drag-bars are attached. These parts form no part of my invention, and are shown and referred to only to illustrate the latter; but I prefer to form the drag-bars of two straps or bars, 0 and O, the rear portions of which are arranged in parallel relation to each other, while the forward ends, which are hinged to the bars B or B, are made to diverge, as shown, to give a broad and bracing support to the drag-bar in a manner well known.

The hoe or tooth (indicated at D) is made, preferably. in the tubular form shown; but any usual or suitable form may be employed, and is provided on its forward face at its upper end with a forwardly-projecting arm, rib, or flange, d, of sufficient Width or depth to give it the required strength and stiffness, and to permit the formation, on its forward end or face, of a segmental rack, d, as shown. This arm or rib is placed between the parallel rear ends of the bars 0 O, forming the drag-bar, and is connected to said ends by means of a pivotal bolt, 0. The segmental rack d is formed, preferably, in an arc of a circle of which the pivot c in rear thereof is the center, and the teeth of the rack, by preference, also are formed or set inclining downward toward their ends, or tangentially rather than radially to the pivot, as tending to give them a firmer grasp on the retaining-pin, and assisting to prevent accidental disengagement from the latter.

E represents a latch or pawl arm, pivoted near its forward end, at 2, between the bars 0 and O, and expanded in width, and forked at its rear end or provided with laterally-projecting ears or ribs 6 e, which overlie and rest upon the bars 0 and O, striding the rack d, and are perforated to receive a break-pin, e of wood or other suitable material, adapting it to break and release the tooth in case the latter meets an obstruction which would be liable to break or injure it. By this arrangement of the pawl or arm E and its pin 6 it will be seen that while the pawl is upheld by the bars 0 and O, in proper position for cansing the pin to engage the segmental rack for holding the tooth against the backward defi'ection, the pin is free to rise with the segment, and to be disengaged from the latter when the tooth is swung or moved forward, either for releasing the tooth or for setting it at a different angle, without necessitating the removal of the pin from the arm or pawl for that purpose, and ordinarily the weight of said arm or pawl will be suflicient to hold the pin engaged with the segmental rack under any adjustment of the tooth. To guard it against accidental displacement, however,-I employ a spring,f, coiled around the pivot c, with its ends upheld by the bars 0 and O", and its loop passing under a heel extension of the pawl U beyond its pivot, as shown, the tension of the spring being exerted to hold the pawl down with the break-pin engaged with the toothed rack on the drill-tooth. Any suitable arrangement of spring may be employed for this purpose.

The operation will be readily understood without further description.

Having now described my invention, I claim as new- 1. The pivoted tooth or hoe provided with the toothed rack, in combination with a movable break-pin, adapted to be disengaged from said rack without being removed or withdrawn from its arm or support, substantially as described.

2. The drill tooth or hoe provided with the toothed rack on its pivoted supporting-arm, in combination with the pivoted pawl for engaging said rack and holding the tooth at any desired adj ustment,substantiall y as described.

3. The pivoted drill tooth or hoe, provided with the toothed rack or segment, in combination with a break-pin secured in a pivoted arm or pawl, for the purpose and substantially as described.

4. The combination of the pivoted hoe or tooth provided with the toothed rack or segment, the break-pin mounted in a pivoted arm or pawl, and a spring for holding said pawl with the break-pin in engagement with said rack, substantially as described.

5. The combination, with the draw-bar, of

the pivoted hoe or tooth provided with the" toothed rack or segment, the pivoted arm or pawl, and the break-pin upheld by said pawl,

GEORGE w. KIRKPATRICK.

Witnesses:

MARTIN DEAN, W. L. AOKER. 

